vt.

1. 松开，解开
   Loosen the screw.

   旋松螺丝。

   loosen one's coat

   解开外衣

2. 放松（限制等）
   loosen discipline

   放松纪律

vi.

1. 松开；松弛，变松
   The government's control over the newspapers has loosened in recent years.

   近几年来政府对报纸的控制变松了。

v.

1. make or become loose.
2. make less strict.
   ▸ (loosen up) warm up in preparation for an activity.